image resize affects every image in folder - asp.net

I am having many webpages and I am using images in every page.I have one folder in my asp.net website.And I have stored my images in that folder.But my problem is when I change width and height of one image then this width and height automatically get applicable to other images that I used in webpages. I tried to change width and height of every image and saved it in aspx file but it didn't work.I am not getting what is the problem.please help.

Do you want to Resize Image of every folder or single folder ?
for getting an idea:
plz visit :
http://www.aspdotnet-suresh.com/2011/05/how-to-resize-size-image-without-losing.html
or
http://www.dotnethelpers.com/Ultimate_Image_Resizer/AspDotNet_Sample

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firstly I'm sorry for my english level.
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There a example from WP Bakery Docs video:

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Here is the one for example: http://webimageresizer.codeplex.com/
// Returns the image mapping to /bla.jpg resized to width of 100 pixels preserving aspect relative to height
http://webimageresizer.codeplex.com/ImageHandler.ashx?src=/bla.jpg&width=100
Let me know if you need more help.

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